EP3467709A1 - Gesichtserkennungsverfahren und -system zur persönlichen identifizierung und authentifizierung - Google Patents
Gesichtserkennungsverfahren und -system zur persönlichen identifizierung und authentifizierung Download PDFInfo
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- EP3467709A1 EP3467709A1 EP18198611.8A EP18198611A EP3467709A1 EP 3467709 A1 EP3467709 A1 EP 3467709A1 EP 18198611 A EP18198611 A EP 18198611A EP 3467709 A1 EP3467709 A1 EP 3467709A1
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Definitions
- the present invention relates generally to anti-spoofing in face recognition for personal identification, authentication, advertisement and other security purposes. Particularly, the present invention relates to a face recognition method and system for tackling spoofing with real-time reenactment video on a high definition display and identifying customers to provide customized services and targeted advertisements.
- Face recognition has numerous security-related applications such as user identification, user authentication for online and offline resource accesses, door and gate unlocking.
- face recognition methods use a real-time captured image of the subject's face to find a match in a library of previously captured facial images.
- the face matching process is relatively accurate in comparison to other biometric identification methods with well-developed and tested facial feature analysis techniques.
- the techniques extract characteristic data of a face region as shown in FIG. 1 , which is unique for each person, from the captured image of the subject's face, and compares the characteristic data against those stored in the library, thereby matching the subject's face to that of a previously registered person.
- Some face recognition systems have been developed to determine whether the subject is a living person by ways of requiring the subject to make multiple facial expressions and movements during an identification session and allowing the system to detect and capture the multiple frames of facial expressions and movements for matching.
- U.S. Patent No. 6,922,478 disclosed a method for verifying the authenticity of a captured image of a person comprising recording a sequence of consecutive individual images of the person and determining the authenticity of the recorded images by checking if at least in two consecutive individual images of the sequence intrinsic movements can be detected.
- an authenticity verifying system may be deceived by printed photographs or an electronic display showing images of the subject to be authenticated as illustrated in FIG. 2 .
- European Patent No. 1990770 disclosed a face authenticating apparatus includes a presentation pattern display unit provided at a different position from a key input unit to display an instruction for a user to input a key pattern during facial authentication; and an image capturing unit for capturing the face of the user and/or a movement of a portion of the face of the user during a portion of or the entire time from when the presentation pattern display unit displays the instruction to when the key input is completed. And from process executed by the apparatus, determine whether the captured face image is of a living person.
- the requirement for interactive inputs limits its applications, usefulness, and the types of users.
- U.S. Patent No. 9,619,723 disclosed a process of 3D perspective check comprising collecting two or more images of the subject's face. The two or more images of the subject's face are then used to calculate the stereoscopic view data of the subject's face.
- a face recognition system could produce false rejection if the subject maintains perfect face alignment with the camera's view center as illustrated in FIG. 3 .
- Face recognition has been known to be an effective way for personal identification.
- Traditional face recognition systems usually capture the face of a particular subject and match it with a library of previously captured facial images in a one-to-one manner for security or authentication purposes.
- a challenge in using face recognition systems for customer identification is that the number of customers to be identified at a particular business premise may not be known in advance. Also, it may be required to detect the presence of customers in a particular area of interest and automatically perform personal identification.
- U.S. Patent No. 9,262,668 discloses a distant face recognition system comprising a primary and a plurality of secondary video cameras provided to monitor a detection area.
- the primary video camera can detect people present in the detection zone.
- Data can be then transmitted to a prioritizor module that produces a prioritized list of detected people.
- the plurality of secondary video cameras then captures a high-resolution image of the faces of the people present in the detection area according to the prioritized list provided by the prioritizor module.
- the high-resolution images can be then provided to a face recognition module, which is used to identify the people present in the detection area.
- PTZ pan-tilt-zoom
- US Patent No. 8,769,556 discloses a method and apparatus for providing targeted advertisements based on face clustering for time-varying video. During operation, video is continuously obtained of users of the system. Users' faces are detected and measured. Measurements of users' faces are then clustered. Once the clusters are available, advertisements are targeted at the clusters rather than individual users. However, as advertisements are targeted at the clusters rather than the individual users in such type of system, the content of the targeted advertisements cannot be personalized and relating to the targeted audience at the more personal level.
- the method of personal identification and authentication comprises capturing an image of a subject to be authenticated; a step of face verification; followed by the process steps of a scan line detection test, a specular reflection detection test, and a chromatic moment and color diversity feature analysis test in no particular order.
- the method requires a subject to present her face before a camera, which can be the built-in or peripheral camera of e.g. a mobile communication or computing device, a computer, or a stationary electronic device.
- the method also requires displaying to the subject certain instructions and the real-time video feedback of the subject's face on a display screen, which can be the built-in or peripheral display screen of the mobile communication or computing device, computer, or stationary electronic device.
- the step of face verification is to capture an image of the subject's face in a single frame shot, then preliminarily verifying the identity of the subject by matching the single frame face image against a database of pre-recorded face data records using existing face analysis and recognition techniques.
- the scan line detection test is based on detecting Moiré patterns created by the overlapping of the digital grid of a spoof image from a digital media display and the grid of an image sensor of a camera in a face-recognition system.
- the spoof image may be an image extracted from a pre-recorded or real-time reenactment video of a person's face displayed on a high-resolution display such as a liquid crystal display (LCD) display.
- LCD liquid crystal display
- the specular reflection detection test is based on the detection of specular reflection features of spoof images displayed in photographs or digital media displays having mirror or reflective surfaces. This is based on the general phenomenon that specular reflection is more likely to happen on a photo or a digital display which are usually of mirror or reflective surfaces whereas diffuse reflection happens on a genuine human face.
- the specular reflection detection test comprises extracting multi-dimensional specular reflection features from the input image wherein the extraction comprises: discarding pixels of intensities outside of pre-defined range; and classifying the extracted specular reflection features to determine whether the input image is an image of a genuine face or a spoof image.
- a support vector machine (SVM) based classifier trained with certain training sets is used to classify the extracted specular reflection features.
- the chromatic moment and color diversity feature analysis test employs a process in which the chromatic features and color histogram of a spoof image, which can be a reproduced face image shown on a printed photo or displayed by a digital media display such as a LCD display, are analyzed to see if its color diversity is reduced in comparison with an image of a genuine face. This is based on the fact that reproduced face images have different color distribution compared to color distribution of genuine faces due to imperfect color reproduction property of printing and digital display.
- the chromatic moment and color diversity feature analysis test comprises extracting the chromatic features and color histogram features of the input image in both hue, saturation, and value (HSV) value space, and red, green, and blue (RGB) color space; and classifying the extracted chromatic features and color histogram features to determine whether the input image is an image of a genuine face or a spoof image.
- HSV hue, saturation, and value
- RGB red, green, and blue
- a SVM based classifier trained with certain training sets is used to classify the extracted chromatic features and color histogram features.
- SVM scores of greater than or equal to zero signifies a positive detection whereas a negative value signifies a rejection.
- an automatic identification and tracking method is provided to identify whether a customer entering a premise, such as a shopping mall or retail store, is a previously registered or remembered customer (or VIP), retrieve profile, demographical data and/or point of sale (POS) records of the customer, track location of the customer, and send the retrieved profile and tracked location of the customer to computing devices configured to be used by sales/service staffs.
- VIP a previously registered or remembered customer
- POS point of sale
- the automatic identification and tracking method further comprises displaying targeted advertisements associated with demographical data of the customer in a frontend device to the customer; detecting a plurality of sentiments of the customer watching the targeted advertisements; measuring a dwell time of watching the targeted advertisements by the customer; and performing analysis on effectiveness of targeted advertisements based on the demographic data, the detected sentiments and measured dwell time of the customer.
- the automatic identification and tracking method further comprises utilizing a plurality of cameras installed at various locations in the.
- the various locations include, but not limited to, advertisement displays, signage devices, merchandise shelves, display counters, entrances, and exits.
- the face recognition system can be implemented in a mobile communication device (e.g. "smartphone” and personal digital assistant), a mobile or personal computing device (e.g. “tablet” computer, laptop computer, and personal computer), a kiosk, or a user terminal having a built-in or peripheral camera and an electronic display screen.
- a mobile communication device e.g. "smartphone” and personal digital assistant
- a mobile or personal computing device e.g. “tablet” computer, laptop computer, and personal computer
- kiosk e.g. "smartphone” computer, laptop computer, and personal computer
- a user terminal having a built-in or peripheral camera and an electronic display screen.
- the face recognition method comprises capturing an input image of an subject to be authenticated; conducting face verification 1001 to verify the identity of the subject by matching the input image against a database of pre-recorded face data records using a face analysis and recognition method, which can be based on presently available techniques; conducting anti-spoofing tests including a scan line detection test 1002, a specular reflection detection test 1003, and a chromatic moment and color diversity feature analysis test 1004.
- a face analysis and recognition method which can be based on presently available techniques
- conducting anti-spoofing tests including a scan line detection test 1002, a specular reflection detection test 1003, and a chromatic moment and color diversity feature analysis test 1004.
- the method also requires displaying to the subject certain instructions and the real-time video feedback of the subject's face on a display screen, which can be the built-in or peripheral display screen of the mobile communication or computing device, computer, or stationary electronic device.
- the step of face verification is to capture an image of the subject's face in a single frame shot, then preliminarily verifying the identity of the subject by matching the single frame face image against a database of pre-recorded face data records using existing face analysis and recognition techniques.
- FIG. 4 shows an exemplary user interface of a face verification apparatus in accordance to an embodiment of the present invention.
- the scan line detection test is to detect Moiré patterns, as shown in FIG. 5 , created by the overlapping of the digital grid from a digital media display and the grid of the image sensor of the camera in the face-recognition system to determine whether the input image is a spoof image provided with a digital media display such as LCD display.
- Moiré patterns as shown in FIG. 5
- FIGs. 7a and 7b peaks can be found in frequency domain of a spoof image captured from a LCD display due to the Moiré patterns whereas no peaks are found in frequency domain of an image captured from a living person.
- the scan line detection test comprises the following steps:
- the scan line detection test further comprises increasing the standard deviation 8 by an increment of ⁇ if p> p min ; repeating the afore-said steps from applying band-pass filtering to determining existence of peaks if ⁇ ⁇ max , where ⁇ max is a pre-defined maximum value of ⁇ ; and determining that no peaks exist in the input image if ⁇ > ⁇ max .
- the specular reflection detection test is to detect specular reflection features of a mirror or reflective surface to determine whether the input image is a spoof image provided with a photograph or a digital media display.
- the specular reflection detection test is based on the detection of specular reflection features of spoof images displayed in photographs or digital media displays having mirror or reflective surfaces. This is based on the fact that specular reflection is more likely to happen on a photo or a digital display which are usually of mirror or reflective surfaces whereas diffuse reflection happens on a genuine human face.
- the specular reflective component is extracted from the input image.
- the process involves separating the reflective component versus the diffuse component based on their chromaticity variation under varying light intensity. For diffuse color, the chromaticity stays constant.
- the specular reflection detection test then comprises: extracting multi-dimensional specular reflection features from the input image, wherein the specular reflective features comprise a specular pixel percentage, an intensity value, and a variation of the pixels; discarding one or more pixels of intensities outside of a pre-defined intensity range (e.g. discarding the one or more pixels with intensities outside of the range [1 ⁇ , 5 ⁇ ], where ⁇ is the mean pixel intensity value); classifying, using machine learning techniques, the extracted specular reflection features to determine whether the input image is a spoof image.
- a SVM based classifier trained with certain training sets is used to classify the extracted specular reflection features.
- the chromatic moment and color diversity feature analysis is based on the general phenomenon of that reproduced face images have a different color distribution than that of genuine face images that is caused by imperfect color reproduction property of printing and digital displays. In addition, color diversity is also reduced in reproduced face images whereas genuine face images generally have richer colors.
- the chromatic moment and color diversity feature analysis test is to detect if the color diversity of the input image is reduced in order to determine whether the input image is a spoof image provided with a print photograph or a digital media display.
- the chromatic moment and color diversity feature analysis comprises extracting the chromatic features and color histogram features of the input image in both HSV and RGB spaces; classifying, using machine learning techniques, the extracted chromatic features and color histogram features to determine whether the input image is a spoof image.
- a SVM based classifier trained with certain training sets is used to classify the extracted chromatic features and color histogram features.
- the automatic identification and tracking method comprises Step 101: receiving a video stream from a camera installed in a premise, such as a shopping mall or retail store; Step 102: determining presence of a customer by face detection in the video stream; Step 103: extracting facial features of the customer; Step 104: matching the extracted facial features of the customer with previously registered customers' facial feature records in a database to determine whether the customer is registered customer (a VIP or a regular customer); Step 105: retrieving profile, which includes, but not limited to, demographical data, and POS records (e.g.
- Step 106 tracking location of the customer based on the location of the camera;
- Step 107 sending the retrieved profile, POS records, and tracked location of the customer to one or more computing devices configured to be used by sales/service staffs;
- Step 108 selecting from a plurality of pre-defined advertisements one or more targeted advertisements based on the retrieved profile, POS records, and tracked location of the customer;
- Step 109 sending notification and contents of the targeted advertisements to a mobile communication device of the customer.
- the selection of targeted advertisements can be based on the featured products/services in the targeted advertisements that are determined to be relevant to one or more of the retrieved profile, POS records, and tracked location of the customer. For example, in the case where the demographical data indicates female in her late twenties with a recent purchase of a baby stroller and a tracked location of infant food section of the store, a selection of targeted advertisements featuring baby formulas is resulted.
- machine learning techniques are employed in targeted-advertisements selection.
- One such machine learning techniques makes use of historical data of POS records and profiles of a plurality of registered customers, and compares with the present customer's profile to identify similarities and patterns of purchases and in turn selects the targeted advertisements accordingly.
- the aforesaid Step 102 and Step 103 are performed using the aforesaid face recognition methods and systems.
- the automatic identification and tracking method further comprises Step 109: collecting the profile, including at least demographical data, of the customer if the customer is not a registered customer.
- the automatic identification and tracking method further comprises Step 110: if the customer is a registered customer, displaying the targeted advertisements in a frontend device to the customer, otherwise, displaying random advertisements in the frontend device to the customer; Step 111: detecting the sentiments of the customer watching the advertisements being displayed in the frontend device; Step 112: measuring a dwell time of the customer watching the advertisements; and Step 113: determining the effectiveness of the advertisements based on the detected sentiments and measured dwell time of the customer. For example, if a pleasant sentiment, i.e.
- the advertisement is considered to be effective.
- a threshold dwell time e.g. 10 seconds
- the advertisement is considered to be effective; otherwise ineffective.
- an unpleasant sentiment i.e. physical display of distasteful emotions (including frown and indifferent emotion) is detected when a particular advertisement, type of advertisement, or advertisement of certain product or service is on display, the advertisement is considered to be ineffective.
- the advertisement effectiveness information associated with the customer are recorded. Subsequent selection of targeted advertisements can then be based on the historical records of effectiveness information of types of advertisement and/or advertisement of certain products or services in addition to the retrieved profile, POS records, and tracked location of the customer.
- the automatic identification and tracking method further comprises utilizing a plurality of cameras installed at various locations in the premise.
- the various locations include, but not limited to, advertisement displays, signage devices, merchandise shelves, display counters, entrances, and exits.
- This information is then sent to the one or more computing devices configured to be used by sales/service staffs, and analyzed for the customer's interests in goods and services and shopping preferences in Step 116. Consequently, the staffs can make use of the analysis results to better market goods and services, and provide a personalized shopping experience to each customer.
- the automatic identification and tracking method preferably comprises dynamically controlling the lighting for capturing of the video streams by the digital video cameras so as to maintain high face recognition accuracy.
- an automatic identification and tracking system 200 comprises at least one camera 201 for capturing video streams; an identification and tracking server 202 for identifying whether a customer is a registered customer (a VIP or a regular customer), retrieving profile, including demographical data, and POS records (e.g. including purchase history) of the customer, tracking location of the customer, and sending the retrieved profile and tracked location of the customer to a plurality of computing devices configured to be used by sales/service staffs; and at least one frontend device 203 for displaying a plurality of advertisements to the customer, collecting profile, including at least demographical data, of the customer through a user interface, which can be a graphical user interface displayed in an electronic touch screen of the frontend device 203.
- the identification and tracking server 202 working in conjunction with camera 201, is further configured for capturing and detecting sentiments of the customer watching the advertisements, measuring a dwell time of watching the advertisements by the customer, and performing analysis on effectiveness of the advertisements from the detected sentiments and measured dwell times.
- the identification and tracking server 202 comprises at least one storage media 204 for storing a database of facial features, demographical data, profiles, and types (e.g. VIP or regular) of registered customers, recorded sentiments and dwell times of the customers with references to the advertisements watched by the customers, and the associated advertisement effectiveness analysis results; at least one face recognition engine 205 for determining presence of customer, extracting facial features, matching the extracted facial features with registered customers' facial feature records in the database, detecting sentiments, meaning dwell times, and analyzing advertisement effectiveness.
- at least one storage media 204 for storing a database of facial features, demographical data, profiles, and types (e.g. VIP or regular) of registered customers, recorded sentiments and dwell times of the customers with references to the advertisements watched by the customers, and the associated advertisement effectiveness
- the cameras 201 are built-in or peripheral cameras of the frontend devices 203.
- the frontend devices 103 comprise at least one electronic display.
- the cameras 201 and the frontend devices 203 are positioned strategically at advertisement displays, merchandise shelves, display counters, entrances and exits of the premise.
- the frontend device 203 is a signage device, such as a kiosk or an electronic billboard, having an electronic display.
- the computing device configured to be used by sales/service staffs can be a personal computer, laptop computer, mobile computing device such as “smartphone” and “tablet” computer, or kiosk configured to execute machine instructions that communicate with identification and tracking server 202 and render a graphical user interface to display data received from the identification and tracking server 202 to and interact with the sales/service staff.
- the mobile communication device of the customer can be a mobile computing device such as "smartphone” and "tablet” computer.
- face recognition system and the automatic identification and tracking system comprise at least machine instructions for rendering and controlling a graphical user interface displayed on the electronic display, machine instructions for controlling the camera for capturing images and videos, machine instructions for performing the face recognition and anti-video-spoofing algorithms, and machine instructions for performing the customer identification and tracking; wherein the machine instructions can be executed using general purpose or specialized computing devices, computer processors, or electronic circuitries including, but not limited to, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA), and other programmable logic devices.
- DSP digital signal processors
- ASIC application specific integrated circuits
- FPGA field programmable gate arrays
- the systems include computer storage media having computer instructions or software codes stored therein which can be used to program computers or microprocessors to perform any of the processes of the present invention.
- the storage media can include, but are not limited to, floppy disks, optical discs, Blu-ray Disc, DVD, CD-ROMs, and magneto-optical disks, ROMs, RAMs, flash memory devices, or any type of media or devices suitable for storing instructions, codes, and/or data.
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US15/727,717 US10061996B1 (en) | 2017-10-09 | 2017-10-09 | Face recognition method and system for personal identification and authentication |
US15/808,910 US20190108551A1 (en) | 2017-10-09 | 2017-11-10 | Method and apparatus for customer identification and tracking system |
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EP3467709A1 true EP3467709A1 (de) | 2019-04-10 |
EP3467709B1 EP3467709B1 (de) | 2020-04-29 |
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EP4027266A1 (de) * | 2021-01-06 | 2022-07-13 | Amadeus S.A.S. | Erkennung von moiré-mustern in digitalen bildern und system zur erkennung von lebendigkeit |
US11670069B2 (en) | 2020-02-06 | 2023-06-06 | ID R&D, Inc. | System and method for face spoofing attack detection |
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US11188944B2 (en) * | 2017-12-04 | 2021-11-30 | At&T Intellectual Property I, L.P. | Apparatus and methods for adaptive signage |
US10936854B2 (en) * | 2018-04-27 | 2021-03-02 | Ncr Corporation | Individual biometric-based tracking |
CN110276263B (zh) * | 2019-05-24 | 2021-05-14 | 长江大学 | 一种人脸识别系统及识别方法 |
DE102019130527A1 (de) * | 2019-11-12 | 2021-05-12 | Shop-Iq Gmbh & Co. Kg | Verfahren und Vorrichtung zur Unterstützung des Verkaufs von zum Verzehr vorgesehenen Waren an eine Vielzahl von Kunden |
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US10885547B1 (en) * | 2020-03-02 | 2021-01-05 | Joseph Gottlieb | Monitoring effectiveness of advertisement placement |
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CN118015663B (zh) * | 2024-04-09 | 2024-07-02 | 浙江深象智能科技有限公司 | 员工识别方法、装置及设备 |
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CN109635623A (zh) | 2019-04-16 |
EP3467709B1 (de) | 2020-04-29 |
US20190108551A1 (en) | 2019-04-11 |
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